My pal has these on his he needs to hold his washer jets on for around 6-7 secs for his to come on think its so they dont come on everytime you wipe your window. (this is in a polo gti though, prob same system though)

Double check that the rear wash wipe doesnt have another tank for water. I know my old pug 205 gti had a washer jet tank in the inside panel of the boot.

Not sure if all A4 Avants are the same, my pre-facelift '99 A4 only has 1 washer bottle, under the bonnet, yet the handbook that came with the car (strangely enough showing post-facelift features) shows another washer bottle behind a cover in the offside rear of the luggage compartment, just like my old '94 80 Avant did....... /ubbthreads/images/graemlins/confused.gif
Regarding rear wash/wipe;presuming that fluid is actually getting to the rear of the car there could be corrosion in the metal pipe that takes washer fluid through the wiper motor itself.
I had the same problem on my '99; only a dribble of fluid was coming out of the washer jet.
One day the rear wiper began working of its own accord ,took the wiper motor off the car to find the motor housing full of liquid! /ubbthreads/images/graemlins/shocked.gif
A replacement wiper motor was fairly easy to fit and cured the problem straight away; from what I can gather this is a fairly common problem on later VAG cars like A3/A4/Polos etc.

My A4, has a washer bottle for the rear in the boot, on the drivers side in a compartment!
I had a Audi 80 that use to do what yours did, ended up having to replace the pipe that ran from the pump to the jet!

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